Schmidt hammers by Proceq, the inventor of rebound hammer technology, have long been the global benchmark for non-destructive compressive strength estimation. Silver Schmidt OS8200 is as accurate, reliable, and versatile as ever — and now, connected, thanks to its optical measurement technology paired with digital productivity features and user-friendly mobile apps.
REBOUND HAMMER TEST METHOD STATEMENT 1.0 Introduction 3.0 Factors That Affects Rebound Hammer Numbers The rebound hammer is one of the most popular nondestructive testing methods used to Since the rebound hammer measures the surface investigate concrete.
ASTM D5873-14, Standard Test Method for Determination of Rock Hardness by Rebound Hammer Method, ASTM International, West Conshohocken, PA, 2014, Back to Top
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In this article, we describe how to Estimate Concrete Strength Using Rebound Hammer. The concept, test method, and applications & limitations are discussed.
ASTM C597 describes procedures for using pulse velocity meters on concrete, but there is not yet an ASTM or AASHTO test procedure for the SONREB method. Many rebound hammers still include a chart converting rebound numbers to a specific compressive …
This test method covers the testing apparatus, sampling, test specimen preparation, and testing procedures for determining the rebound hardness number of rock material using a spring-driven steel hammer, referred to variously as a rebound hammer, impact test hammer, or concrete test hammer. This test method is best suited for rock material with uniaxial compressive strengths ranging between ...
Schmidt Hammer, Type L (N/mm 2) Supports the following standards: ASTM C805, ASTM D5873. The H-2975L hammer is designed for testing thin-walled structural components with a thickness of less than 4" (100mm) or rock cores. This hammer features an impact of 0.74 Nm, which is 1/3 less energy than type N hammers and uses a N/mm 2 scale.
It is important to note that ASTM C805 states that rebound values cannot be used as the basis to accept or reject concrete. Pushing the test hammer's piston against the surface of hardened concrete loads a spring mechanism until it trips and releases a hammer mass.
A. You are correct, Provision 1.7.4.2 of ACI 301-20 allows use of a rebound hammer in accordance with ASTM C805/C805M, if specified by the Architect/Engineer, only "to evaluate uniformity of in-place concrete or to select areas to be cored.". The same restriction applies to the pulse velocity method per ASTM …
Proper use of the Rebound Hammer . Updated to reflect the changes to ASTM C805 . The Rebound Hammer has been around since the late 1940's and today is a commonly used method for estimating the compressive strength of in-place concrete. Developed in 1948 by a Swiss engineer named Ernst Schmidt, the device measures the hardness of concrete surfaces
astm c579 rebounding hammer. Review of the Rebound Hammer Method Estimating. ISBN 978-93-84468-11-8 Proceedings of International Conference on Architecture And Civil Engineering ICAACE 14 Dubai December 25-26 2014 pp 118-127 Review of the Rebound Hammer Method Estimating Concrete Compressive Strength on Site...
According to Provision 1.7.4.2 of ACI 301-20, a rebound hammer cannot be used for in-place strength testing. Does ACI recommend any other nondestructive testing (NDT) method for in-place strength evaluation? A. You are correct, Provision 1.7.4.2 of ACI 301-20 allows use of a rebound hammer in accordance with ASTM C805/C805M, if specified by the ...
As the Rebound Hammer approaches 2,000 uses, it may start to read outside of the range of 80 ±2 on the test Anvil. At this point an inspection by our service center is suggested. Safety: • When using this device wear safety glasses • Do not fire the Rebound Hammer against any body part Specifications: Humboldt Concrete Rebound Hammer: H-2987H
03-07-2021· The concrete rebound hammer test (often referred to as Schmidt Hammer) was invented in 1948 and is still a popular choice to test the compressive strength of concrete. To use this method, the rebound hammer must first be calibrated against a …
industry standards such as ASTM C805 / EN 12504-2 / BS 1881 part 202 / DIN 1048, part 2 / A 83.307 / ISO / DIS 8045. 3. Types of rebound hammers Several hundred thousands of Schmidt rebound hammers are in uses worldwide (Baumann, 2006). In 1954 Proceq SA was founded and has been producing the original Schmidt rebound hammers since then, without any
5. IS: 13311 (Pat 2)- 1992, Methods of non-destructive testing of concrete Rebound Hammer. 6. Revised CPWD Specifications, 2002 for Cement Mortar, Cement Concrete and RCC Works. 7. BS 1881: Part 202-1986, Recommendations for surface hardness testing by rebound hammer. 8. ASTM C805-85, Test for Rebound Number of Hardened Concrete. 9.
Property Test Method Results Compressive Strength ASTM C579 11,200 PSI Tensile Strength ASTM C2370 7,300 PSI Fluxural Strength ASTM D790 7,770 PSI [Filename: Floropoxy4805rev3.pdf] - Read File Online - Report Abuse
05-08-2018· Procedure for Schmidt hammer test or Rebound Hammer Test: Before starting the procedure calibration of the hammer is required. To do this, the Schmidt hammer is tested against the Steel test anvil which has a Brinell hardness number of about 5000MPa. Clean the surface of concrete, ensure the concrete is clean and dirt free.
31-08-2020· Reference standards. ASTM C 805 "Standard test method for rebound number of Hardened concrete" can be used to estimate the uniformity of concrete and detect areas of inferior quality within a concrete structure.. Test Area and Interferences. Selection of test surface; Select the area of concrete surface which is free from honeycombs, air voids, rough texture, scaling and any troweled …
This rebound hammer has a compressive strength ranging from 1,450—10,152psi (10—70mPa) and impact energy of 2.207Nm (1.63ft-lbf). The Gilson rebound test hammer is a reliable, economical Type N model and meets ASTM C805, BS 1881-202, and EN 12504-2 standard test methods. It features a rugged mechanism with a proven history of accuracy and ...
03-07-2021· The concrete rebound hammer test (often referred to as Schmidt Hammer) was invented in 1948 and is still a popular choice to test the compressive strength of concrete. To use this method, the rebound hammer must first be calibrated against a steel test anvil.
Proceq's Original Schmidt OS8000 Concrete Strength Test Rebound Hammer is the world's most advanced R-value concrete test hammer - unrivaled for testing, reporting and analysis of concrete strength and uniformity.
Compressive Strength 8000 – 9000 psi (55 – 62 MPa) ASTM C579 Method B Flexural Strength 1800 – 2500 psi (13-17 MPa) ASTM D790 Linear Shrinkage <0.2% DuPont Tensile Strength 1000 – 1200 psi (6.90-8.25 MPa) ASTM D638 Type I Compressive Modulus 6 1.1-1.2 x 10 (7.50-8.50 GPa) ASTM C579 …
ASTM C579-18, Standard Test Methods for Compressive Strength of Chemical-Resistant Mortars, Grouts, Monolithic Surfacings, and Polymer Concretes, ASTM International, West Conshohocken, PA, 2018,
Procedure. Before doing the test, the rebound hammer should be calibrated through a testing anvil and ensure the result is trusty. The anvil should be steel & having Brinell hardness 5000N/Sqmm. Ensure the surface of the concrete was cleaned or rub the surface through the rubbing stone or grinding wheel.
30-03-2012· The method for determining the rebound number of hardened concrete is given in ASTM C805. The uses of the rebound hammer are given in Section 5.1 of C805, which states that "this test method is applicable to assess the in-place uniformity of the concrete, to delineate regions in a structure of poorer quality or deteriorated concrete, and to estimate strength."